In today’s climate, it is considered to be rational and scientific when some material cause is ascribed to the origin of life: lightning, molecules on crystals, aliens who came from non-life. Ascribing a non-material cause to life’s origin, such as intelligence, on the other hand, is said to be irrational and unscientific. Intelligence is unintelligence, because only non-intelligence can be intelligent.
Krauss seems to think that if he describes how one thing comes from another, probing into smaller and smaller things, he will eventually come to nothing at the bottom of it all, as the cause of it all. But talking about how some things come from other things says nothing about how they can come from nothing.
